rATI's Vibration & Shock Measurement: Professional ... · PDF fileSensor and system dynamic ... principle resembles that of a loudspeaker, ... vibration for HALT, ESS and HASS,...

Register online at www.ATIcourses.com or call ATI at 888.501.2100 or 410.956.8805 Vol. 97 – 13

Course Outline1. Minimal math review of basics of vibration,

commencing with uniaxial and torsional SDoFsystems. Resonance. Vibration control.

2. Instrumentation. How to select and correctly usedisplacement, velocity and especially acceleration andforce sensors and microphones. Minimizing mechanicaland electrical errors. Sensor and system dynamiccalibration.

3. Extension of SDoF to understand multi-resonantcontinuous systems encountered in land, sea, air andspace vehicle structures and cargo, as well as in electronicproducts.

4. Types of shakers. Tradeoffs between mechanical,electrohydraulic (servohydraulic), electrodynamic(electromagnetic) and piezoelectric shakers and systems.Limitations. Diagnostics.

5. Sinusoidal one-frequency-at-a-time vibrationtesting. Interpreting sine test standards. Conducting tests.

6. Random Vibration Testing. Broad-spectrum all-frequencies-at-once vibration testing. Interpretingrandom vibration test standards.

7. Simultaneous multi-axis testing graduallyreplacing practice of reorienting device under test (DUT)on single-axis shakers.

8. Environmental stress screening (ESS) ofelectronics production. Extensions to highly acceleratedstress screening (HASS) and to highly accelerated lifetesting (HALT).

9. Assisting designers to improve their designs by (a)substituting materials of greater damping or (b) addingdamping or (c) avoiding "stacking" of resonances.

10. Understanding automotive buzz, squeak andrattle (BSR). Assisting designers to solve BSR problems.Conducting BSR tests.

11. Intense noise (acoustic) testing of launch vehiclesand spacecraft.

12. Shock testing. Transportation testing. Pyroshocktesting. Misuse of classical shock pulses on shock testmachines and on shakers. More realistic oscillatory shocktesting on shakers.

13. Shock response spectrum (SRS) forunderstanding effects of shock on hardware. Use of SRSin evaluating shock test methods, in specifying and inconducting shock tests.

14. Attaching DUT via vibration and shock testfixtures. Large DUTs may require head expanders and/orslip plates.

15. Modal testing. Assisting designers.

April 1-3, 2009College Park, Maryland

April 14-16, 2009Fullerton, California

May 11-13, 2009Dayton, Ohio

$2595 (8:00am - 4:00pm)“Also Available As A Distance Learning Course”

(Call for Info)"Register 3 or More & Receive $10000 each

Off The Course Tuition."

SummaryThis three-day course is primarily designed for

test personnel who conduct, supervise or"contract out" vibration and shock tests. It alsobenefits design, quality and reliability specialistswho interface with vibration and shock testactivities.

Each student receives the instructor's brandnew, minimal-mathematics, minimal-theoryhardbound text Random Vibration & ShockTesting, Measurement, Analysis & Calibration.This 444 page, 4-color book also includes a CD-ROM with video clips and animations.

Vibration and Shock Measurement & Testingfor Land, Sea, Air, Space Vehicles & Electronics Manufacture

InstructorWayne Tustin is President of Equipment

Reliability Institute (ERI), aspecialized engineering school andconsultancy. His BSEE degree isfrom the University of Washington,Seattle. He is a licensedProfessional Engineer - Quality inthe State of California. Wayne's first

encounter with vibration was at Boeing/Seattle,performing what later came to be called modaltests, on the XB-52 prototype of that highlyreliable platform. Subsequently he headed fieldservice and technical training for a manufacturerof electrodynamic shakers, before establishinganother specialized school on which he left hisname. Wayne has written several books andhundreds of articles dealing with practical aspectsof vibration and shock measurement and testing.

What You Will Learn• How to plan, conduct and evaluate vibration

and shock tests and screens.• How to attack vibration and noise problems.• How to make vibration isolation, damping and

absorbers work for vibration and noise control.• How noise is generated and radiated, and how

it can be reduced.From this course you will gain the ability to

understand and communicate meaningfullywith test personnel, perform basicengineering calculations, and evaluatetradeoffs between test equipment andprocedures.

www.ATIcourses.com

Boost Your Skills with On-Site Courses Tailored to Your Needs The Applied Technology Institute specializes in training programs for technical professionals. Our courses keep you current in the state-of-the-art technology that is essential to keep your company on the cutting edge in today’s highly competitive marketplace. Since 1984, ATI has earned the trust of training departments nationwide, and has presented on-site training at the major Navy, Air Force and NASA centers, and for a large number of contractors. Our training increases effectiveness and productivity. Learn from the proven best. For a Free On-Site Quote Visit Us At: http://www.ATIcourses.com/free_onsite_quote.asp For Our Current Public Course Schedule Go To: http://www.ATIcourses.com/schedule.htm

We commence with the simple single-resonance SDoF or Single Degree of Freedom system and use it to learn about accelerometerconstruction, selection, proper usage and calibration. Our aim throughout this course is to emphasize practice of measurement, analysis, calibration and testing.

Figure 1 Piezoelectric Accelerometers

courtesy Endevco

Figure 2 Compression Piezoelectric Accelerometer

Figure 3 Back-to-Back Calibration

courtesy The Modal Shop

Then we examine simple beams and plates, more realistic in that each has several resonances.

Figure 4 Pair of Cantilever Beams in First Three Modes

Video Clip 1 Second Mode, with Strobe

1, 2

2, 3

0, 1

Figure 5 Natural Modes Of A Cable

Equipment Reliability Institute

We spend several hours evaluating electrohydraulic (servohydraulic) shakers and their low-frequency long-stroke applications. Also electrodynamic shakers, whose operating principle resembles that of a loudspeaker, their power amplifiers and their digital controls.

Figure 6 Electrohydraulic (Servohydraulic) Shaker

Figure 7 Shaker/Wheel Interface

Figure 8 Cutaway Views of Electrodynamic Shaker

courtesy MB Dynamics

Figure 9 Armature-guiding flexure

Courtesy Dynamic Solutions

courtesy Dynamic Solutions

Figure 10 System Block Diagram

TESTSPEC

CONTROL ACCELEROMETER

SPECTRUMANALYZER

METER

UUT

FIXTURE

SHAKER

BUILDING

RECORDER OSCILLOSCOPE

POWER

AMPLIFIERSIGNAL

SOURCECONTROL

Figure 11 Power Amplifier

(courtesy MB Dynamics)

Figure 12 Power Amplifier Module

Figure 13 Digital Sine Test Controls

(Courtesy Data Physics)

Finally, we are ready to commence our study of random (unpredictable in detail) vibration in rocketry, automotive and other applications. This includes understanding of PSD (Power Spectral Density) and its strange g2/Hz units.

Figure 14 “Random” means Unpredictable

Figure 15

Early Rocket Liftoff

Figure 16 Terrain Inputs are Random

Figure 17 Compact Data Acquisition

Not illustrated here: Day 3’s discussion of multi-axis vibration for HALT, ESS and HASS, principally aimed at electronics production, generally using multi-axis pneumatic “bangers” or RS repetitive shocks

Nor the design, fabrication and use of fixtures for attaching test hardware to shakers.

Nor mechanical shock measurement, analysis and testing. Or modal testing.